A fortress is easier to protect because it's simpler: it has no windows, few doors, no skylights, or vent systems through which an intruder might sneak.

堡垒的保护更容易因为它构造更简单：它没有窗口、几乎没有几道门，没有天窗或通风系统这些入侵者可能利用的东西。

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Most of the students, professors and others who came to vent their anger did so peacefully, but one group broke off from the main rally, smashed windows and set fires.

大多数前来发泄愤怒的学生，教师和其他人员表现得比较镇静，但有一部分人冲出人群，砸碎窗户并纵火。

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Windows and doors should be opened in order to vent the blast if detonation should occur.

窗户和门应保持打开，以备爆炸发生后迅速消散烟雾。

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Across the street is the Holloway's Milk Duds factory and every twenty minutes, some vent opens and exhales a cloud of powerful Milk Dud aroma, which wafts in the open windows.

NPR: A Job's Saving Graces: Milk Duds and Doughnuts

Not only does it have eye candy amenities like a glass elevator and porcelain floors, but it also has a long list of green features including a solar heat pool, vent-less fireplaces fueled by bio-ethanol, and thermal glass double-glazed U.V. windows.

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